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Many sites out there (some supported by the soy industry) will claim that soy doesn’t have any impact on men’s health.

In fact, it’s still often heralded as a superfood, despite some resounding scientific evidence to the contrary.

For example, researchers at the Colorado State University found a molecule back in 1982 called equol (this is an isoflavone – more on those later).

When men eat soy, their levels of equol go up.

Then, in 2004, those same researchers found that equal is actually a strong anti-androgen, inhibiting the production of dihydrotestosterone (DHT).

Another example (and there are dozens of studies) that hits a little closer to the issue of ED was a case study of a vegan 19 year old man.

He suffered:

A sudden onset of loss of libido and erectile dysfunction after the ingestion of large quantities of soy-based products

When the diet stopped and the soy ingestion returned to normal levels, his testosterone and DHEA levels returned to normal, and his performance problems in the bedroom ceased entirely.

The researchers concluded that this was the result of isoflavones acting on his sex hormones (source).

Finally, a study on 35 men looked at different levels of soy consumption over 57 days. The researchers gave their participants either milk, a little bit of soy protein, or a lot of soy protein.

Here’s what they found:

•Those who didn’t take any soy protein saw their androgen levels stay the same

•Low protein soy decreased their DHT/testosterone levels by 9%

• High protein soy decreased their DHT/testosterone levels by 15%

•Both low and high protein soy increased their levels of estradiol and estrone (source)

These are just three examples of a multitude of studies that show that soy decreases testosterone an increases female sex hormones like estrogen.

Soy Isoflavones Mimic Estrogen

The studies above mention something called isoflavones. Isoflavones are the main reason why soy is bad for men’s health in general and your morning wood in particular.

Isoflavones are molecules in soy that mimic the effect of estrogen and bind to estrogen receptors in your body.

Soy contains genistein, daidzein, glycitein.

These are all various types of isoflavones. Isoflavones are further characterized as phytoestrogens, which is a plant material that mimics hormones.

What this means for your body is that it thinks that it’s producing more estrogen then it is, which suppresses testosterone and other androgen production (as we’ve seen).

Unfortunately, since soy is in baby formula, scientists have started to look at the impact of consuming soy early in life on erections in adulthood

By looking at rats and feeding them different levels of soy, researchers have found a relationship between how much soy they consume and how skinny their erections are as adults.

Essentially, the more soy the rats have early on, the thinner their erections are later in life.

What this means, if you were bottle fed on a soy based formula, you might want to start thinking about boosting your testosterone, since you’re already facing an uphill battle.

So we know that soy, because of its estrogen-like properties, reduces your testosterone. And we know the less testosterone you have, the harder it is to get it hard.

But soy isn’t done yet…

Why soy makes it hard to get hard and stay hard.

Sometimes it seems like soy is uniquely trying to keep soft dudes soft.

In addition to reducing testosterone while making your body think it has more estrogen, soy also has a negative impact on your ability to get blood into your penis and keep it there.

An article published in Urology in 2008 looked at the impact of daidzein (one of soy’s pesky isoflavones) on smooth muscle cells, collagen and elastic fibers.

These are three key physical structures your body uses to build erections.

In normal circumstances, when you get aroused the soft, spongy tissue in your penis fills with blood and gets trapped, which causes your package to swell.

However, when the researchers dosed rats with daidzein, they found that the rats’ collagen levels increased and their smooth muscle and elastic fibers decreased.

In other words, the rats who were given daidzein had more penile collagen, less blood flow, and softer, weaker erections (source).

Phytic Acid in Soy Reduces Mineral Absorption

In order to get a good quality erection, you need to be putting the right stuff in, especially minerals.

Specifically, you need healthy levels of:

Calcium

Zinc

Magnesium

Selenium

Manganese

Iron

Iodine

Since your body can’t manufacture minerals, you need to get them into your system, and then you need to absorb them so your body can use them (unabsorbed minerals are generally just peed out).

Soy interferes with the absorption process of calcium, magnesium, copper, iron and zinc because of its high level of phytic acid.

Phytic acid tends to hang around as well, and the only way to get it out of soy is from long, slow fermentation.

And since most soy consumption in the West comes from unfermented soy found in most processed foods, many men take in too much phytic acid, and have low mineral levels as a result.

Soy Reduces Sex Drive And Vitality

Last but not least, soy has a negative impact on your sex drive and vitality.

Several animal studies have demonstrated that soy reduces mounting behavior and sexual frequency.

A study in the journal Human Reproduction found that men who had the most soy in their diet only had between a half to a third as much sperm per milliliter as non-soy eaters.

Another study found that genistein interferes with the ability of your body to make sperm by interfering with the enzyme that catalyses the reaction turning cholesterol into testosterone in the Leydig cells….

Which further drops your testosterone levels and reduces sperm production.

Soy and Erectile Dysfunction – Conclusion:

To recap, soy is terrible for your erections because it:

Reduces your testosterone levels

Negatively impacts semen parameters

Makes your body think it has more estrogen than it does (further suppressing testosterone production)